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-* ARM Generic Interrupt Controller
-
-ARM SMP cores are often associated with a GIC, providing per processor
-interrupts (PPI), shared processor interrupts (SPI) and software
-generated interrupts (SGI).
-
-Primary GIC is attached directly to the CPU and typically has PPIs and SGIs.
-Secondary GICs are cascaded into the upward interrupt controller and do not
-have PPIs or SGIs.
-
-Main node required properties:
-
-- compatible : should be one of:
- "arm,cortex-a15-gic"
- "arm,cortex-a9-gic"
- "arm,cortex-a7-gic"
- "arm,arm11mp-gic"
-- interrupt-controller : Identifies the node as an interrupt controller
-- #interrupt-cells : Specifies the number of cells needed to encode an
- interrupt source. The type shall be a <u32> and the value shall be 3.
-
- The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI
- interrupts.
-
- The 2nd cell contains the interrupt number for the interrupt type.
- SPI interrupts are in the range [0-987]. PPI interrupts are in the
- range [0-15].
-
- The 3rd cell is the flags, encoded as follows:
- bits[3:0] trigger type and level flags.
- 1 = low-to-high edge triggered
- 2 = high-to-low edge triggered
- 4 = active high level-sensitive
- 8 = active low level-sensitive
- bits[15:8] PPI interrupt cpu mask. Each bit corresponds to each of
- the 8 possible cpus attached to the GIC. A bit set to '1' indicated
- the interrupt is wired to that CPU. Only valid for PPI interrupts.
-
-- reg : Specifies base physical address(s) and size of the GIC registers. The
- first region is the GIC distributor register base and size. The 2nd region is
- the GIC cpu interface register base and size.
-
-Optional
-- interrupts : Interrupt source of the parent interrupt controller on
- secondary GICs, or VGIC maintenance interrupt on primary GIC (see
- below).
-
-- cpu-offset : per-cpu offset within the distributor and cpu interface
- regions, used when the GIC doesn't have banked registers. The offset is
- cpu-offset * cpu-nr.
-
-Example:
-
- intc: interrupt-controller@fff11000 {
- compatible = "arm,cortex-a9-gic";
- #interrupt-cells = <3>;
- #address-cells = <1>;
- interrupt-controller;
- reg = <0xfff11000 0x1000>,
- <0xfff10100 0x100>;
- };
-
-
-* GIC virtualization extensions (VGIC)
-
-For ARM cores that support the virtualization extensions, additional
-properties must be described (they only exist if the GIC is the
-primary interrupt controller).
-
-Required properties:
-
-- reg : Additional regions specifying the base physical address and
- size of the VGIC registers. The first additional region is the GIC
- virtual interface control register base and size. The 2nd additional
- region is the GIC virtual cpu interface register base and size.
-
-- interrupts : VGIC maintenance interrupt.
-
-Example:
-
- interrupt-controller@2c001000 {
- compatible = "arm,cortex-a15-gic";
- #interrupt-cells = <3>;
- interrupt-controller;
- reg = <0x2c001000 0x1000>,
- <0x2c002000 0x1000>,
- <0x2c004000 0x2000>,
- <0x2c006000 0x2000>;
- interrupts = <1 9 0xf04>;
- };